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Coast Guard Chief Engineer (Steam Or Motor) Unlimited Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf
- What is the primary function of an evaporator in a steam propulsion
- Remove oxygen from feedwater
- Produce potable water
- Convert seawater into distilled water
- Regulate condenser pressure
plant?
Answer: C
The evaporator uses heat to distill seawater into freshwater for boiler make-up and domestic use.
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2. Excessive salinity in a boiler is most likely to cause:
- Flame failure
- Condensate contamination
- Foaming and carryover
- Superheater overheating
Answer: C
High salinity reduces water purity and leads to foam formation, causing water carryover into steam lines.
3. A reduction gear in a propulsion system primarily:
- Increases turbine rpm
- Controls lube oil flow
- Matches turbine speed to propeller speed
- Reduces shaft vibration
Answer: C
Turbines operate at high rpm; the reduction gear lowers rpm to the efficient propeller range.
4. The purpose of an economizer is to:
- Increase feed pump pressure
- Recover heat from exhaust gases 2 / 4
- Reduce boiler water density
- Maintain furnace draft
Answer: B
Economizers preheat feedwater by utilizing heat from boiler flue gases, improving efficiency.
- What is the primary purpose of a duplex lube oil strainer?
- Lubricate gear teeth
- Permit cleaning without stopping the system
- Reduce oil viscosity
- Prevent cavitation
Answer: B
A duplex strainer has two baskets, allowing one to remain online while the other is cleaned.
6. The main cause of water hammer in steam lines is:
- Excessive insulation
- Too much superheat
- Condensed water accumulation
- Leaking safety valves 3 / 4
Answer: C
Condensed water forms slugs that impact elbows and valves when carried by high-velocity steam.
7. The primary function of a thrust bearing in a propulsion shaft line is to:
- Absorb radial shock
- Prevent misalignment
- Transmit propeller thrust to the hull
- Support shaft weight
Answer: C
Thrust bearings transfer axial force from the propeller to the ship’s structure.
8. A cracked furnace tube in a water-tube boiler will first show:
- High steam pressure
- Drop in steam temperature
- Water in the furnace
- Increase in feed pump pressure
Answer: B
Steam temperature typically drops due to loss of heat transfer efficiency from the damaged tube.
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